A ball is thrown with a velocity of 25m/s at a building. The building is 20m high; the man throwing the ball is 40m from the front wall and is standing in depression so that the ball leaves at his hand at the same elevation as the base of the building. If the ball strikes the side of the building 2s after being thrown, at what height above the base of the building did the ball strike the building? What is the velocity of striking?